In this case, why did Madame Ping send the jade annuluses here?

"Madame Ping intended to murder Young Master? I... I don't think it possible. Madame Ping's son, the Fourth Prince, is on good terms with Young Master, and Madame Ping offered timely help to Madame several times. Logically speaking, I don't think she harbors evil intentions toward Young Master," Baisu said in puzzlement.

It was not because she did not believe Lin Mengya's judgment, but because ...